Samsung lost a big battle in their patent war against Apple on Friday. Apple alleges that Samsung infringed on a whole bunch of Apple patents around the iOS interface.
If you were wondering why Apple doesn't cut to the chase and just sue Google, from my understanding, it's because that's where the money is. It's easier to win hardware patents, especially when Google is releasing Android for free. Don't worry, though. Now that Google owns Motorola Mobility, there's plenty of hardware Apple can use for lawsuits against Google now.